Cannizzaro reaction is an example of

Options

A. Disproportionation reaction
B. Decomposition reaction
C. Condensation reaction
D. Displacement reaction

Answer

### Step-by-Step Solution:

1. **Understanding Cannizzaro Reaction**: The Cannizzaro reaction is a chemical reaction that involves the disproportionation of aldehydes that do not contain alpha hydrogen atoms.

2. **Identifying Aldehydes**: Aldehydes such as formaldehyde (HCHO) and benzaldehyde (C6H5CHO) are examples of compounds that can undergo the Cannizzaro reaction because they lack alpha hydrogens.

3. **Reaction Conditions**: The Cannizzaro reaction occurs in the presence of a strong base, typically concentrated sodium hydroxide (NaOH).

4. **Reaction Mechanism**: In the Cannizzaro reaction, one molecule of the aldehyde is oxidized while another molecule is reduced. For example, formaldehyde can be converted into methanol (reduction) and sodium formate (oxidation).

5. **Disproportionation Reaction**: Since the same species (the aldehyde) undergoes both oxidation and reduction, this reaction is classified as a disproportionation reaction.

6. **Exclusion of Other Reaction Types**:
- **Decomposition Reaction**: This type involves breaking down a compound into simpler substances, which does not occur in the Cannizzaro reaction.
- **Condensation Reaction**: This involves the combination of two molecules with the loss of a small molecule (like water), which is not applicable here.
- **Displacement Reaction**: This involves the replacement of one element in a compound with another, which also does not occur in the Cannizzaro reaction.

7. **Conclusion**: Therefore, the Cannizzaro reaction is an example of a disproportionation reaction.

### Final Answer:
The Cannizzaro reaction is an example of a **disproportionation reaction**.

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